I made an account just to comment on this.
I assist a smaller streamer on MFC. Cam rooms can be very overwhelming. Between putting on a show, managing the topic, talking in chat, keeping track of tips/requests, and moderating for trolls, it can be quite cumbersome. When you add in other issues like technical problems, ADHD, alcohol, and such, a room helper can go a long way. I agree with other who have said that the best helper/mod doesn't make a big deal of it. However, when the 400th person comes in asking for a private, it's often easier to explain how the model handles it rather than waiting for the model to find the message and stop the conversation to explain something for the Nth time.
People don't realize that some helpers/mods really put a lot of time and effort to help their model. We put hours of work behind the scenes on our own to make sure the model can do her job easier. Be mad at bad helpers/mods, not all of them.